How much is in the jar? That one that you keep and toss all your loose change into—that is, unless you're the type of man who always drops his spare coins into tip jars (or the even rarer type nowadays who gives exact change). It's a question popular in elementary school math classes, but the answer is important for you, too. It's a lot.

Last year, the TSA collected over half a million dollars in change. (Because you're curious, the most came from Miami International Airport, reports McClatchy: $39,613.) The money is now being going to provide U.S. service members and their families rest areas in airports.